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... in
which two liquid components are instantly mixed via high-pressure and
flow into a mold at low pressure. They harden into a tough polymer. In just a few minutes
even a large part is completed, taken out and the next part cycle begun.
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Copyright ©2000
Bayer Corporation. All Rights Reserved
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The molds (tooling) used with the RIM process can be machined aluminum,
or composite-hybrid material. Tooling cost can be significantly reduced due to
the lower internal pressure employed in the RIM process compared to
injection molding of thermoplastics, especially as part size increases.
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Technical Details
The
liquid reactants are temperature-controlled and equipped with agitators. The components are fed through supply lines to
metering units which precisely proportion the reactants at
high pressure to the mix heads. Between shots, the
reactants are re-circulated through the system at low
pressure in order to maintain consistent temperature and
pressure. When the shot is made, valves in the mix head open and
the reactants enter a mix chamber at pressures between 1,500 and 3,000 psi. From the mix chamber,
the mixture flows into the mold at
approximately atmospheric pressure. A piston cleans the mix chamber and seals the
mold. The mix head is
attached directly to the mold, all the reacted material
can be demolded with the part, allowing for the next shot
with minimum preparation.
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© 2008 Rimnetics, Inc. Mountain View & Loomis, California | Rimnetics is ISO 9001:2000 Certified
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